Print frame to printer

the top frame is packing.php
the bottom frame is hidden.php

the button is in packing.php...
when u click the button..it will print
contents of hidden frame...

<input type="submit" name="Submit" value="Print Order Label" onClick="document.hidden.print()">
==>returns document.hidden is not an object

can anyone tell me how to go about doing that whether in javascript or php??? thank you.

first, name the frames when they're created.

then:
onClick="top.hidden.focus();top.hidden.print();"

haven't tried it in a bit, but it should be close. doesn't work on macs.

thanks brandon.

i have got 3 buttons now.
would u advice using onclick or some other event handlers.